GTD Audio G-380HL VHF Wireless Microphone System with 2 Handheld & 2 Headset, Lavalier (Lapel) mics 4 Channel Receiver with 2 handheld, 2 Belt pack transmitters & lavalier, headset Mics Individual volume controls on each Channel 230 feet ( 65 Meters ) Range One 1/4" Mixed output and four XLR Individual outputs Frequency: 240Mhz-260Mhz ( This microphone unit is a fixed frequency unit, only one unit can work at one time. Multiple units can not work together and will cause interference with each other)